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How would a reduction in the number of aquaporins channels affect a plant cell’s ability to adjust to new osmotic conditions?

Short Answer

Expert verified

The reduction in the number of aquaporin channels in plants slows down the ability of the plant to adjust to changes in its osmotic environment. Within normal conditions, the aquaporin channel allows rapid osmotic adjustment in plants.

Step by step solution

01

Aquaporin channels

Aquaporins are the channels that are located on the plasma and intracellular membrane of the plant cells. They maintain water transport across the plasma membrane.

02

Function of aquaporin channels

Osmotic conditions in the plant are adjusted by special channels called aquaporin channels. They maintain the movement of water and small molecules (boric acid and urea) inside and outside the cell. They also maintain the transport of gases such as ammonia and carbon dioxide across the cell.

03

Effect of low aquaporin channels in plants

The active solute transport across the membrane results in the generation of an osmotic gradient. The generation of an osmotic gradient alters the transport of water across the membrane.

Thus, in response to this osmotic gradient, aquaporins help transport water across the biological membrane. Therefore, if the aquaporin channel gets reduced, the ability of plants cell to adjust to changes in the osmotic environment is also reduced.

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Most popular questions from this chapter

A Minnesota gardener notes that the plants immediately bordering a walkway are stunted compared with those farther away. Suspecting that the soil near the walkway may be contaminated from salt added to the walkway in winter, the gardener tests the soil. The composition of the soil near the walkway is identical to that farther away except that it contains an additional 50 mM NaCl. Assuming that the NaCl is completely ionized, calculate how much it will lower the solute potential of the soil at 20°C using the solute potential equation:

ΨS = -iCRT

where i is the ionization constant (2 for NaCl), C is the molar concentration (in mol/L), R is the pressure constant [R = 0.00831 (L · MPa)/(mol · K)], and T is the temperature in Kelvin (273 + °C). How would this change in the solute potential of the soil affect the water potential of the soil? In what way would the change in the water potential of the soil affect the movement of water in or out of the roots?

How are the Casparian strip and tight junctions similar (see Figure 6.30)?

Compared with a cell with few aquaporin proteins in its membrane, a cell containing many aquaporin proteins will

(A) have a faster rate of osmosis.

(B) have a lower water potential.

(C) have a higher water potential.

(D) accumulate water by active transport.

Compare and contrast the forces that move phloem sap and xylem sap over long distances.

WHAT IF? Apple growers in Japan sometimes make a nonlethal spiral slash around the bark of trees that are destined for removal after the growing season. This practice makes the apples sweeter. Why?

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